IntegrityError: column name is not unique

[anonymous]

Trac detected an internal error:
IntegrityError: column name is not unique

Python Traceback
Most recent call last:
File "/usr/lib64/python2.7/site-packages/trac/web/main.py", line 522, in _dispatch_request
  dispatcher.dispatch(req)
File "/usr/lib64/python2.7/site-packages/trac/web/main.py", line 208, in dispatch
  chosen_handler)
File "/usr/lib64/python2.7/site-packages/trac/web/main.py", line 350, in _pre_process_request
  chosen_handler = filter_.pre_process_request(req, chosen_handler)
File "/usr/lib64/python2.7/site-packages/defaultcc/admin.py", line 77, in pre_process_request
  cc.insert()
File "/usr/lib64/python2.7/site-packages/defaultcc/model.py", line 59, in insert
  (self.name, _fixup_cc_list(self.cc)))
File "/usr/lib64/python2.7/site-packages/trac/db/util.py", line 65, in execute
  return self.cursor.execute(sql_escape_percent(sql), args)
File "/usr/lib64/python2.7/site-packages/trac/db/sqlite_backend.py", line 78, in execute
  result = PyFormatCursor.execute(self, *args)
File "/usr/lib64/python2.7/site-packages/trac/db/sqlite_backend.py", line 56, in execute
  args or [])
File "/usr/lib64/python2.7/site-packages/trac/db/sqlite_backend.py", line 48, in _rollback_on_error
  return function(self, *args, **kwargs)